make cloud onboarding survey disableable via runtime feature flag (#7407)

## Summary

The survey is causing some friction. It incurs about 5-10% dropoff.
Although that number is actually somewhat slow, the information has
mostly served its purpose for now. We can toggle it freely once this PR
is merged.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7407-make-cloud-onboarding-survey-disableable-via-runtime-feature-flag-2c76d73d365081648195f322cb0d7a64)
by [Unito](https://www.unito.io)

src/platform/remoteConfig/types.ts

@@ -38,6 +38,7 @@ export type RemoteConfig = {
   asset_update_options_enabled?: boolean
   private_models_enabled?: boolean
   subscription_tiers_enabled?: boolean
+  onboarding_survey_enabled?: boolean
   stripe_publishable_key?: string
   stripe_pricing_table_id?: string
 }